By A. A. Ranicki

This booklet provides the definitive account of the functions of this algebra to the surgical procedure category of topological manifolds. The crucial result's the id of a manifold constitution within the homotopy form of a Poincaré duality area with an area quadratic constitution within the chain homotopy form of the common conceal. the adaptation among the homotopy sorts of manifolds and Poincaré duality areas is pointed out with the fibre of the algebraic L-theory meeting map, which passes from neighborhood to worldwide quadratic duality buildings on chain complexes. The algebraic L-theory meeting map is used to provide a in basic terms algebraic formula of the Novikov conjectures at the homotopy invariance of the better signatures; the other formula inevitably components via this one.

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The pair is B-contractible, C-Poincar´e and the boundary is D-Poincar´e). Deﬁne inverse isomorphisms ≃ Ln−1 (A, C, D) −−→ Ln (F ) ; (C, ϕ) −−→ ((C, ϕ), (C−−→0, (0, ϕ))) , ≃ Ln (F ) −−→ Ln−1 (A, C, D) ; (f : C−−→D, (δϕ, ϕ)) −−→ (C ′ , ϕ′ ) with (C ′ , ϕ′ ) the (n − 1)-dimensional symmetric complex in (A, C, D) obtained from (C, ϕ) by algebraic surgery on the n-dimensional symmetric pair (f : C−−→D, (δϕ, ϕ)) in (A, B, C). (ii) As for (i), with symmetric replaced by quadratic. 9 (ii) to obtain a quadratic structure on the eﬀect of surgery on a normal pair.

10 The n-dimensional for n ∈ Z. Proof The functor S 2 : B (A)−−→B (A) is an isomorphism of additive categories. g. g. 3. (i) The quadratic L-groups of Aq (R) for q = h (resp. p) are the free (resp. projective) versions of the 4-periodic quadratic L-groups of Wall [180] Ln (Aq (R)) = Lqn (R) (n ∈ Z) . ´ complexes 1. Algebraic Poincare 33 (ii) The symmetric L-groups of Aq (R) for q = h (resp. p) are the 4-periodic versions of the free (resp. projective) symmetric L-groups of Mishchenko [115] Ln (Aq (R)) = lim Ln+4k (R) = Ln+4∗ (R) (n ∈ Z) .

The total complex is the chain complex HomA (C, D) deﬁned by ∑ dHomA (C,D) : HomA (C, D)r = HomA (C−p , Dq ) p+q=r −−→ HomA (C, D)r−1 ; f −−→ dD f + (−)q f dC . Deﬁne Σn C to be the chain complex in A with dΣn C = (−)r dC : (Σn C)r = Cr−n −−→ (Σn C)r−1 = Cr−1−n . The nth homology group Hn (HomA (C, D)) (n ∈ Z) is the abelian group of chain homotopy classes of chain maps f : Σn C−−→D. The isomorphisms of chain objects ≃ (Σn C)r = Cr−n −−→ (S n C)r = Cr−n ; x −−→ (−)r(r+1)/2 x deﬁne an isomorphism of chain complexes Σn C ∼ = S n C.